Magnoliaceae

Vázquez-García, J. Antonio, Pérez-Farrera, Miguel Ángel, Gómez-Domínguez, Héctor, Muñiz-Castro, Miguel Ángel & Sahagún-Godínez, Eduardo, 2017, Magnolia montebelloensis, a new species in section Magnolia from Lagunas de Montebello National Park, Chiapas, México, with a key to Magnoliaceae of Chiapas, Phytotaxa 328 (2), pp. 101-114 : 112

Key to the species of Magnoliaceae in Chiapas

1. Petioles with long stipular scar; schistosyncarp with circumcissile dehiscence ( Magnolia sect. Talauma , subsect. Talauma ) ...... 2

- Petioles with stipular scar absent or not evident; polyfollicle with dorsal dehiscence ( Magnolia sect. Magnolia ) .................... … 3

2. Abaxial portions of carpels detaching from fruit axis and falling mostly in large irregular many-carpellate masses; fruit broadly ovoid to ellipsoid; carpels 89–92, slightly humped; stamens 175–179, Selva Zoque ............................................. M. perezfarrerae

- Abaxial portions of carpels detaching from fruit axis and falling singly; fruits broadly ovoid to subglobose; carpels 61–70 (80), non-humped; stamens 198–248, Selva Lacandona ................................................................................................... M. lacandonica

3. Mature polyfollicles densely pubescent, 7.0–12.0 (15.0), 3.0–5.0 (5.3) cm in diam. ...................................................................... 4

- Mature pollyfollicles glabrous to glabrescent, 3.0–6.0 (–7.0) cm long, 2.0–3.7 (4.4) cm in diam. ................................................. 5

4. Leaf blades cuneate, narrowly obovate, shortly and abruptly acuminate, glabrous; carpels 42–57; stamens 95–97 (Chiapas and Guatemala) ......................................................................................................................................................................... M. mayae

- Leaf blades broadly obovate to ovate, obtuse at the apex, abaxially with shortly appressed pubescence; carpels 85–99 (–100), stamens 220–240 ........................................................................................................................................................... … M. sharpii

5. Fruits 2.5–3.4 cm in diam, carpels 22–40 ........................................................................................................................................ 6

- Fruits 1.7–2.5 cm in diam, carpels 14–20 ........................................................................................................................................ 7

6. Carpels (22–)24–34(–35), stamens (53–)60–66(–85) …...................................................................................... M. montebelloensis

- Carpels 36–40, stamens 100–120 ..................................................................................................................... M. faustinomirandae

7. Fruit ellipsoid, carpels 18–20 (Motozintla and Tacaná) ........................................................................................................... M. sp.

- Fruits subglobose, carpels 14–18 ................................................................................................................................... M. zamudioi